Two-needle sewing-machine



J. KERR. iif t w g-flfiEDLB SEWING MAC No. 59s,s4e.

(No Model.)

Patented Feb. 1, 18981,

nw'suron." I ATTORNEY,

UN TED STATES llliQE,

AIME--.

JOHN KERR, OF DAYTON, KENTUCKY, ASSIGNOR TO THE SINGER MANU-.

FACTUBING COMPANY, on NEW JERSEY.

TWO-NEEDLE SEWINGJQMACHINE.

SPECIFICATION forming part of Letters Patent No. 598,346, dated February1, 1898.

Application filed June 13, 1896.

desirable with this class of machines tosus pend the operation of one ofthe needles for a few stitches, as in turning square corners.

In the drawings, Figure'l is a rear side elevation of a Singersewing-machine embodying my invention, and Fig. 2 is a partial plan viewof the head of the same. Figs. 3, 4, 5, and 6 are detailviews of upperparts of the two needle-bars and their connections; and Fig. 7 is apartial-frontview of the head with the face-plate removed.

In the form of my invention herein shown the contiguously-placedneedle-bars a a, each carrying a needle I), are made as half-round bars,so as to reciprocate in the usual round hearings in the head at theforward end of the arm A, the needle-bar Ct being connected in the usualmanner to the crank at the forward end of the driving-shaft journaled inthe upper part of said arm. The needle-bar a is coupled to the bar a bya pin 0, free to slide horizontally in a collar d, brazed or otherwiserigidly secured to the bar a at or near the top thereof. The head of thepin 0 has anaperture, through which freely passes a rod or arm e of asmallrock-shaftf, journaled in a block 9 and having a second arm h,joined by a connecting-rod i to a lever 76, pivoted at m and extendingdown through the work-plate B, so as to be operated from beneath saidwork-plate by any suitable treadle or kneelever connections.

A spring '21,, attached to the standard of the arm A and to the lever70, below the fulcrum of the latter, presses the upper end of said leverforward, and thus normally, through the rod "6, arm h, rock-shaft f, andarm 6, holds Serial No. 595,450. (No model.)

the coupling-pin c in connection with the main needle-bar a, so that theauxiliary nee dle-bar a will be caused to reciprocate vertically withthe main needle-bar owing to this coupled connection'of the twobars, thehead of the pin 0 at such times reciprocating freely on the rod or arme, passing loosely through the hole in said head.

When it desired to throw the auxiliary needle-bar a out of operation,the attendant moves the lower end of the lever it forward or inopposition to the stress of the spring 02, thus throwing the upper endof the rod or arm e outward far enough so that when the needle-bars areat the top of their stroke the coupling-pin will be withdrawn from themain needle-bar, which latter will continue to reciprocate, While theauxiliary needle-bar, being now disconnected from its means ofoperation, will remain at rest, being retained in its raised position bya spring 0, interposed between a collar p, attached to the mainneedle-bard, and'a collar r, fast on the auxiliary needle-bar a, theoperating-pitman for the said main needle-bar a being connected withsaid collar 19. The dotted lines in Fig. 1 denote the position of theparts when the needie-bars are disconnected from each other.

' When the auxiliary needle-bar a is again to be set into operation, thelever 70 is released and is restored toits normal position by thespring. 72, and the coupling pin 0 is thus pressed inward, so that asthe main needlebar arises said pin rides over an interior incline a ofthe said bar a and then snaps into its coupling-hole in said bar whenthe latter reaches the top of its upstroke.

It will thus be understood that by means of the devices herein describedthe auxiliary needle-bar may be thrown into or out of operation withoutstopping the machine, so that in turning corners, where it is desirableto shorten one row of stitches, this may be done without delay ortrouble, the attendant controlling the action of the auxiliaryneedle-bar by a knee-lever or treadle, leaving the hands free tomanipulate the work.

Having thus described my invention, I claim and desire to secure byLetters Patent-- 1. In a sewing-machine, the combination too with theneedle-bars a and a, of the couplingpin 0, the rock-shaft f having thearm e, engaging said coupling-pin, and the arm h, the lever 70, itscontrolling-spring n and the rod 2' connecting said lever with said armh.

2. In a sewing-machine, the combination with the two contiguously-placedneedle-bars a and a, the former having the incline d of the coupling-pinc, means for yieldingly press.- ing said pin towardsaid incline andmeans for Withdrawing said pin when the auxiliary needle-bar a is to beuncoupled from the main needle-bar a.

3. In a sewing-machine, the combination with the two contiguously-placedneedle-bars a and a, the former having the incline a of the coupling-pinc, the rock-shaftf having the arm 6, engaging said coupling-pin, and thearm h, the spring-actuated lever is, the rod 2' connecting said leverwith said arm h, and a spring for holding said needle-bar a in anelevated position when said coupling-pin is Withdrawn from said bar a.

i. In a sewing-machine, the combination with a main needle-bar, of anauxiliary needle-bar, a coupling device, carried by said mainneedle-bar, for connecting one of said needle-bars to the other, .anactuatinglever, and connections between said lever and said couplingdevice whereby the latter may be actuated to connect or disconnect saidneedlebars without stopping the machine.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN KERR.

Witnesses:

WM. LONNEY, J 1., JOHN F. ELLIOTT.

